Super Best Audio Friends
The evolution of the original irreverent and irrelevant and non-authoritative site for headphone measurements, i.e. frequency response graphs, CSD waterfall plots, subjective gear reviews. Too objective for subjectivists; too subjective for objectivists
Well finally, I honestly believe that we have it! This the truly the HD800(S) for the folks who do no like the tonal signature of the HD800(S), but appreciate everything else it can do. During my time with the sample (one of many of which this turned out to be the production version), I thoroughly enjoyed every minute. Wait I thought - this possibly can't be anything based on the HD800(S) - it's not bright at all!
Drop x Sennheiser HD8XX v2 Frequency Response
Once I had the cabinets lined with No-Res, the crossover and drivers installed, I have to say for an ~1.2 cubic foot standmount, these speakers are heavy! The cabinets are very stiff and also well-damped. I have beefier pair of speaker stands coming for them. My cost including built, veneered and stained cabinets, and speaker premium crossover parts and $45 sheet of No-Res: ~$915. This included the trick components in the crossover, like the Miflex copper caps (which are pretty pricey).
Additionally, whilst measuring this DAC there have been some....oddities which haven't occurred on other devices. It seems that Denafrips is doing a fair amount of DSP on this DAC which hinders some measurements.
John Atkinson of stereophile found that he was completely unable to even do a linearity test as the transfer function made it present a strange stepped zigzag result. Whilst testing this device I found that swept sine tests behaved unusually, with frequency response results often looking either outright wrong or with a strange 'rippling' toward the end which differed in appearance dependent on the length of the sweep.
Demo'd the MHA200 at theSourceAV today. Thank you to Wayne there for keeping me informed and letting me know when they came in, then assisting me with the listening session.
I heard two different units, one with stock tubes and the other with a pair of GE Military 5751's from Upscale audio. The stock unit took input from RCA's coming from a Chord Qutest and the 5751 unit had balanced inputs from an SPL Director. I was very curious how it would sound with a good R2R DAC like Yggdrasil or Gungnir Multibit, although I had none to try. Both amps were brand new with minimal break-in. Headphones demo'd were HD6XX, HD800SDR, LCD2.1, LCD-X, LCD-4, Utopia, Clear Mg,
Build: Simple, and solid. No problems. Just one quirk. The cups rotate so that they face down when the headphones are placed down on a surface. But they rotate the wrong way. When you’re holding them the way you wear them, with the left cup in your left hand and the right cup in your right hand, as if you just them off, the cups rotate towards you, which you can’t really do with your wrists, and certainly can’t put them down that way. They only rotate half way away from you. This feels like someone just goofed and they got 10,000 pairs in the mail and cursed to high heaven. Not that big a deal, it’s funny more than anything else. The headband doesn’t fold so it does’t really affect their use, it’s just a little awkward putting them down. I wind up just putting them down on their side instead of twisting the cups so they are facing down.
The original Loki I never really gave much thought to. As an audio purist somewhat, the OG Loki was just another unnecessary piece of gear in the signal path, mucking things up. Yes, I could hear the OG Loki when it was switched in the signal path. However, the truth is that I didn't know what to do with the wide EQ bands of the Loki. I knew how to use PEQ and/or digital EQ to get the results I wanted - in a surgical way. This is where @rhythmdevils came in. I've always loved his approach because it's experimental as he uses his senses without the aid of measurements, numbers, etc. It's a human approach. Probably too much to the chagrin of today's objectivists. But who cares? When was the last time we went to a headphone to meet up with real people with shared interests and bumped into an objectivist. Never. Anyway, I heard that @rhythmdevils that the Loki EQ is supposed to be fun, a right brained activity. Do it Marv, you have good ears. Use the Force. I know you don't need measurements. Have fun. And you know what, he's absolutely right!
Say goodby to the “Audeze veil”! A slightly bright Audeze! The LCD-XC is much much better than I ever imagined it would be. I consider Audeze’s drivers the best planar magnetic headphone drivers ever made (I’ve heard them all, and I’ve modded Audeze headphones and heard the drivers with what I consider better acoustic treatment), but I don’t think they have figured out how to put them Ito an enclosure and implement acoustic treatments that allow them to really shine. They do much better here than I anticipated. I thought the LCD-XC would be a resonant mess. It’s actually pretty well controlled. Though not perfect.
Klippel QC analyzer
Furman SP-20A headphone amp
ACO Pacific 7052SYS microphone
Brüel & Kjaer 4231 mic calibrator
Mr BlockHead™ flat plate coupler
density similar to average human head 1.08 g/cc
width consistent with average human head 15.25 cm
Historically a low distortion 1 KHz sine generator would have stimulated the electro-acoustic transducer using a low distortion amplifier. Then a steep 1 KHz notch filter removes the stimulus and the measured level of what remains is compared to the stimulus level. That ratio results in THD+N. Now consider the capability of a modern acoustic analyzer.
Single number metrics used for audio component performance rankings are absurd when one realizes how much information is missing.
The new earpads still have the suspicious felt material between the adhesive ring and the earpads which seems to be an intentional filtered leak to increase soundstage. It seems to be there on purpose and this is what it would achieve. Better soundstage while holding onto bass response. The most important thing though is the difference in sound...
The first rationale for this testing using real headphones was to ascertain the effects of back-EMF with respect to global negative feedback. A resistor load will not provide back-EMF. However a headphone driver really isn't that much different from a microphone. If we shout loud enough into a headphone driver and measure at the phono jack, we will see voltage. The second rationale was to ascertain the effects of back-EMF with respect to current capability. It was cited that USB dongle AIOs exhibited sloppier more one-note bass than desktop headphone amplifiers.
Lo and behold, I most certainly did not expect this! A real headphone load (Sennheiser HD650) resulted in up to 50db worse THD than a dummy 300 ohm load at 37Hz with the Topping L30 amplifier!
Anyway, the One Ring is vanquished. F the Eye of Sauron.
^ Silk baffle vents. I think I roughed up driver front filter paper when I was trying to figure out how to take the rest apart.